package socket.utils;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

/**
 * @author 陶乐乐(wangyiqianyi@qq.com)
 * @ClassName: ByteUtil.java
 * @Description:处理各种类型转换
 * @date 2017-12-26 上午11:16
 */
public class ByteUtil {
	/**
	 * 截取字节数组
	 * @param src
	 * @param begin
	 * @param count
	 * @return
	 */
	public static byte[] subBytes(byte[] src, int begin, int count) {
		byte[] bs = new byte[count];
		for (int i=begin; i<begin+count; i++) bs[i-begin] = src[i];
		return bs;
	}

	public static byte[] toByteArray(int iSource, int iArrayLen) {
		byte[] bLocalArr = new byte[iArrayLen];
		for (int i = 0; (i < 4) && (i < iArrayLen); i++) {
			bLocalArr[i] = (byte) (iSource >> 8 * i & 0xFF);
		}
		return bLocalArr;
	}

	public static int byteToInt(byte b) {
		return b & 0xFF;
	}

	public static int byteArrayToInt(byte[] b) {
//        return   b[3] & 0xFF |
//                (b[2] & 0xFF) << 8 |
//                (b[1] & 0xFF) << 16 |
//                (b[0] & 0xFF) << 24;
		// 一个byte数据左移24位变成0x??000000，再右移8位变成0x00??0000

		int targets = (b[0] & 0xff) | ((b[1] << 8) & 0xff00) // | 表示安位或
				| ((b[2] << 24) >>> 8) | (b[3] << 24);
		return targets;
	}

	public static String getLongHex(byte[] buf) {
		long r = 0;
		for (int i = buf.length - 1; i >= 0; i--) {
			r <<= 8;
			r |= (buf[i] & 0x00000000000000ff);
		}
		String result = "0000000" + Long.toHexString(r).toUpperCase();
		return result.substring(result.length() - 8);
	}

	//----------------------------------------------------------------------------------------------
	/**
	 * 转换short为byte
	 *
	 * @param b
	 * @param s
	 *            需要转换的short
	 * @param index
	 */
	public static void putShort(byte b[], short s, int index) {
		b[index + 1] = (byte) (s >> 8);
		b[index + 0] = (byte) (s >> 0);
	}

	/**
	 * 通过byte数组取到short
	 *
	 * @param b
	 * @param index
	 *            第几位开始取
	 * @return
	 */
	public static short getShort(byte[] b, int index) {
		return (short) (((b[index + 1] << 8) | b[index + 0] & 0xff));
	}

	/**
	 * 转换int为byte数组
	 *
	 * @param bb
	 * @param x
	 * @param index
	 */
	public static void putInt(byte[] bb, int x, int index) {
		bb[index + 3] = (byte) (x >> 24);
		bb[index + 2] = (byte) (x >> 16);
		bb[index + 1] = (byte) (x >> 8);
		bb[index + 0] = (byte) (x >> 0);
	}

	/**
	 * 通过byte数组取到int
	 *
	 * @param src
	 * @param offset
	 *            第几位开始
	 * @return
	 */
	public static int getInt(byte[] src, int offset) {
//        return (int) ((((bb[index + 3] & 0xff) << 24)
//                | ((bb[index + 2] & 0xff) << 16)
//                | ((bb[index + 1] & 0xff) << 8) | ((bb[index + 0] & 0xff) << 0)));
		int value;
		value = (int) ((src[offset] & 0xFF)
				| ((src[offset+1] & 0xFF)<<8)
				| ((src[offset+2] & 0xFF)<<16)
				| ((src[offset+3] & 0xFF)<<24));
		return value;
	}

	/**
	 * 转换long型为byte数组
	 *
	 * @param bb
	 * @param x
	 * @param index
	 */
	public static void putLong(byte[] bb, long x, int index) {
		bb[index + 7] = (byte) (x >> 56);
		bb[index + 6] = (byte) (x >> 48);
		bb[index + 5] = (byte) (x >> 40);
		bb[index + 4] = (byte) (x >> 32);
		bb[index + 3] = (byte) (x >> 24);
		bb[index + 2] = (byte) (x >> 16);
		bb[index + 1] = (byte) (x >> 8);
		bb[index + 0] = (byte) (x >> 0);
	}

	/**
	 * 通过byte数组取到long
	 *
	 * @param bb
	 * @param index
	 * @return
	 */
	public static long getLong(byte[] bb, int index) {
		return ((((long) bb[index + 7] & 0xff) << 56)
				| (((long) bb[index + 6] & 0xff) << 48)
				| (((long) bb[index + 5] & 0xff) << 40)
				| (((long) bb[index + 4] & 0xff) << 32)
				| (((long) bb[index + 3] & 0xff) << 24)
				| (((long) bb[index + 2] & 0xff) << 16)
				| (((long) bb[index + 1] & 0xff) << 8) | (((long) bb[index + 0] & 0xff) << 0));
	}

	/**
	 * 字符到字节转换
	 *
	 * @param ch
	 * @return
	 */
	public static void putChar(byte[] bb, char ch, int index) {
		int temp = (int) ch;
		// byte[] b = new byte[2];
		for (int i = 0; i < 2; i ++ ) {
			bb[index + i] = new Integer(temp & 0xff).byteValue(); // 将最高位保存在最低位
			temp = temp >> 8; // 向右移8位
		}
	}

	/**
	 * 字节到字符转换
	 *
	 * @param b
	 * @return
	 */
	public static char getChar(byte[] b, int index) {
		int s = 0;
		if (b[index + 1] > 0)
			s += b[index + 1];
		else
			s += 256 + b[index + 0];
		s *= 256;
		if (b[index + 0] > 0)
			s += b[index + 1];
		else
			s += 256 + b[index + 0];
		char ch = (char) s;
		return ch;
	}

	/**
	 * float转换byte
	 *
	 * @param bb
	 * @param x
	 * @param index
	 */
	public static void putFloat(byte[] bb, float x, int index) {
		// byte[] b = new byte[4];
		int l = Float.floatToIntBits(x);
		for (int i = 0; i < 4; i++) {
			bb[index + i] = new Integer(l).byteValue();
			l = l >> 8;
		}
	}

	/**
	 * 通过byte数组取得float
	 *
	 * @param b
	 * @param index
	 * @return
	 */
	public static float getFloat(byte[] b, int index) {
		int l;
		l = b[index + 0];
		l &= 0xff;
		l |= ((long) b[index + 1] << 8);
		l &= 0xffff;
		l |= ((long) b[index + 2] << 16);
		l &= 0xffffff;
		l |= ((long) b[index + 3] << 24);
		return Float.intBitsToFloat(l);
	}

	/**
	 * double转换byte
	 *
	 * @param bb
	 * @param x
	 * @param index
	 */
	public static void putDouble(byte[] bb, double x, int index) {
		// byte[] b = new byte[8];
		long l = Double.doubleToLongBits(x);
		for (int i = 0; i < 4; i++) {
			bb[index + i] = new Long(l).byteValue();
			l = l >> 8;
		}
	}

	/**
	 * 通过byte数组取得float
	 *
	 * @param b
	 * @param index
	 * @return
	 */
	public static double getDouble(byte[] b, int index) {
		long l;
		l = b[0];
		l &= 0xff;
		l |= ((long) b[1] << 8);
		l &= 0xffff;
		l |= ((long) b[2] << 16);
		l &= 0xffffff;
		l |= ((long) b[3] << 24);
		l &= 0xffffffffl;
		l |= ((long) b[4] << 32);
		l &= 0xffffffffffl;
		l |= ((long) b[5] << 40);
		l &= 0xffffffffffffl;
		l |= ((long) b[6] << 48);
		l &= 0xffffffffffffffl;
		l |= ((long) b[7] << 56);
		return Double.longBitsToDouble(l);
	}

	//----------------------------------------------------------------------------------------------
	/**
	 * 将一个单字节的byte转换成32位的int
	 *
	 * @param b
	 *            byte
	 * @return convert result
	 */
	public static int unsignedByteToInt(byte b) {
		return (int) b & 0xFF;
	}

	/**
	 * 将一个单字节的Byte转换成十六进制的数
	 *
	 * @param b
	 *            byte
	 * @return convert result
	 */
	public static String byteToHex(byte b) {
		int i = b & 0xFF;
		return Integer.toHexString(i);
	}

	/**
	 * 将一个4byte的数组转换成32位的int
	 *
	 * @param buf
	 *            bytes buffer
	 * @param pos 中开始转换的位置
	 * @return convert result
	 */
	public static long unsigned4BytesToInt(byte[] buf, int pos) {
		int firstByte = 0;
		int secondByte = 0;
		int thirdByte = 0;
		int fourthByte = 0;
		int index = pos;
		firstByte = (0x000000FF & ((int) buf[index]));
		secondByte = (0x000000FF & ((int) buf[index + 1]));
		thirdByte = (0x000000FF & ((int) buf[index + 2]));
		fourthByte = (0x000000FF & ((int) buf[index + 3]));
		index = index + 4;
		return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL;
	}

	/**
	 * 将16位的short转换成byte数组
	 *
	 * @param s
	 *            short
	 * @return byte[] 长度为2
	 * */
	public static byte[] shortToByteArray(short s) {
		byte[] targets = new byte[2];
		for (int i = 0; i < 2; i++) {
			int offset = (targets.length - 1 - i) * 8;
			targets[i] = (byte) ((s >>> offset) & 0xff);
		}
		return targets;
	}

	/**
	 * 将32位整数转换成长度为4的byte数组
	 *
	 * @param s
	 *            int
	 * @return byte[]
	 * */
	public static byte[] intToByteArray(int s) {
		byte[] targets = new byte[4];
		for (int i = 0; i < 4; i++) {
			int offset = (targets.length - 1 - i) * 8;
			targets[i] = (byte) ((s >>> offset) & 0xff);
		}
		return targets;
	}

	/**
	 * long to byte[]
	 *
	 * @param s
	 *            long
	 * @return byte[]
	 * */
	public static byte[] longToByteArray(long s) {
		byte[] targets = new byte[8];
		for (int i = 0; i < 8; i++) {
			int offset = (targets.length - 1 - i) * 8;
			targets[i] = (byte) ((s >>> offset) & 0xff);
		}
		return targets;
	}

	/**32位int转byte[]*/
	public static byte[] int2byte(int res) {
		byte[] targets = new byte[4];
		targets[0] = (byte) (res & 0xff);// 最低位
		targets[1] = (byte) ((res >> 8) & 0xff);// 次低位
		targets[2] = (byte) ((res >> 16) & 0xff);// 次高位
		targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。
		return targets;
	}

	/**
	 * 将长度为2的byte数组转换为16位int
	 *
	 * @param res
	 *            byte[]
	 * @return int
	 * */
	public static int byte2int(byte[] res) {
		// res = InversionByte(res);
		// 一个byte数据左移24位变成0x??000000，再右移8位变成0x00??0000
		int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00); // | 表示安位或
		return targets;
	}

	public static short bytesToShort(byte[] bytes) {
		return ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN).getShort();
	}

	private static ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);

	public static byte[] longToBytes(long x) {
		buffer.putLong(0, x);
		return buffer.array();
	}

	public static long bytesToLong(byte[] bytes) {
		buffer.put(bytes, 0, bytes.length);
		buffer.flip();//need flip
		return buffer.getLong();
	}

	//----------------------------------------------------------------------------------------------

	final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();

	public static String bytesToHex(byte[] bytes) {
		if(bytes==null){
			return new String();
		}
		char[] hexChars = new char[bytes.length * 2];

		for (int j = 0; j < bytes.length; j++) {
			int v = bytes[j] & 0xFF;
			hexChars[j * 2] = hexArray[v >>> 4];
			hexChars[j * 2 + 1] = hexArray[v & 0x0F];
		}

		return new String(hexChars);
	}

	public static byte[] hexToBytes(String hexRepresentation) {
		int len = hexRepresentation.length();
		byte[] data = new byte[len / 2];

		for (int i = 0; i < len; i += 2) {
			data[i / 2] = (byte) ((Character.digit(hexRepresentation.charAt(i), 16) << 4)
					+ Character.digit(hexRepresentation.charAt(i + 1), 16));
		}

		return data;
	}

	/**
	 * 将byte[]数组转化为String类型
	 * @param arg
	 *            需要转换的byte[]数组
	 * @param length
	 *            需要转换的数组长度
	 * @return 转换后的String队形
	 */
	public static String toHexString(byte[] arg, int length) {
		String result = new String();
		if (arg != null) {
			for (int i = 0; i < length; i++) {
				result = result
						+ (Integer.toHexString(
						arg[i] < 0 ? arg[i] + 256 : arg[i]).length() == 1 ? "0"
						+ Integer.toHexString(arg[i] < 0 ? arg[i] + 256
						: arg[i])
						: Integer.toHexString(arg[i] < 0 ? arg[i] + 256
						: arg[i])) + " ";
			}
			return result;
		}
		return "";
	}
	/**
	 * 将short转为高字节在前，低字节在后的byte数组
	 * @param n short
	 * @return byte[]
	 */
	public static byte[] toHH(short n) {
		byte[] b = new byte[2];
		b[1] = (byte) (n & 0xff);
		b[0] = (byte) (n >> 8 & 0xff);
		return b;
	}
	/**
	 * 将short转为低字节在前，高字节在后的byte数组
	 * @param n short
	 * @return byte[]
	 */
	public static byte[] toLH(short n) {
		byte[] b = new byte[2];
		b[0] = (byte) (n & 0xff);
		b[1] = (byte) (n >> 8 & 0xff);
		return b;
	}
	/**
	 * 将int转为低字节在前，高字节在后的byte数组
	 * @param n int
	 * @return byte[]
	 */
	public static byte[] toLH(int n) {
		byte[] b = new byte[4];
		b[0] = (byte) (n & 0xff);
		b[1] = (byte) (n >> 8 & 0xff);
		b[2] = (byte) (n >> 16 & 0xff);
		b[3] = (byte) (n >> 24 & 0xff);
		return b;
	}

	/**
	 * 将int转为高字节在前，低字节在后的byte数组
	 * @param n int
	 * @return byte[]
	 */
	public static byte[] toHH(int n) {
		byte[] b = new byte[4];
		b[3] = (byte) (n & 0xff);
		b[2] = (byte) (n >> 8 & 0xff);
		b[1] = (byte) (n >> 16 & 0xff);
		b[0] = (byte) (n >> 24 & 0xff);
		return b;
	}
	public static byte[] hexStrToByteArray(String str)
	{
		if (str == null) {
			return null;
		}
		if (str.length() == 0) {
			return new byte[0];
		}
		byte[] byteArray = new byte[str.length() / 2];
		for (int i = 0; i < byteArray.length; i++){
			String subStr = str.substring(2 * i, 2 * i + 2);
			byteArray[i] = ((byte)Integer.parseInt(subStr, 16));
		}
		return byteArray;
	}
	/**
	 * 合并byte数组
	 */
	public static byte[] unitByteArray(byte[] byte1,byte[] byte2){
		byte[] unitByte = new byte[byte1.length + byte2.length];
		System.arraycopy(byte1, 0, unitByte, 0, byte1.length);
		System.arraycopy(byte2, 0, unitByte, byte1.length, byte2.length);
		return unitByte;
	}
	public static String makeChecksum(String data) {
		if (data == null || data.equals("")) {
			return "";
		}
		int total = 0;
		int len = data.length();
		int num = 0;
		while (num < len) {
			String s = data.substring(num, num + 2);
			total += Integer.parseInt(s, 16);
			num = num + 2;
		}
		/**
		 * 用256求余最大是255，即16进制的FF
		 *//*
		int mod = total % 256;*/
		String hex = Integer.toHexString(total);
		len = hex.length();
		// 如果不够校验位的长度，补0,这里用的是两位校验
		if (len < 2) {
			hex = "0" + hex;
		}
		return hex;
	}
	/**
	 * 16进制直接转换成为字符串(无需Unicode解码)
	 * @param hexStr
	 * @return
	 */
	public static String hexStr2Str(String hexStr) {
		String str = "0123456789ABCDEF";
		char[] hexs = hexStr.toCharArray();
		byte[] bytes = new byte[hexStr.length() / 2];
		int n;
		for (int i = 0; i < bytes.length; i++) {
			n = str.indexOf(hexs[2 * i]) * 16;
			n += str.indexOf(hexs[2 * i + 1]);
			bytes[i] = (byte) (n & 0xff);
		}
		return new String(bytes);
	}
	public static String getMac(String data){
		StringBuilder  sb = new StringBuilder (data);
		sb.insert(10, ":");
		sb.insert(8, ":");
		sb.insert(6, ":");
		sb.insert(4, ":");
		sb.insert(2, ":");
		return sb.toString();
	}
}
